Conduit fitting



\ JP. DUNMIRE CONDUIT FITTING Filed Oct-50. 1925 Nov. 19, 1929.

l/ll/IA INVENTOR.

ATTORNEYS.

Patented Nov. 1 9, 1929 mane Russian. :9. DUNIVIIRE, on ERIE, PENNSYLVANIA, nssreNon'ro ERIE MALLEABLE InoN COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION on PENNSYLVANIA OONDUI'I" FITTING Application filed October 30, 1925. Serial No. 65,825.

' duits and is particularly directed to the manner of securing such conduits in the fitting.

The invention is illustrated in the accompanying drawings as follows i Fig. 1 shows a side elevation of an exemplification of a fitting in the form of a conduit box, the box being partly in section on the line 11 in Fig. 2.

Fig. 2 is a section on the line 2-2 in Fig. 1.

Fig. 3 an end elevation of the box.

Fig. 4 a side elevation of a contracting sleeve. I

1 marks the box body. This is provided with a conduit-receiving extension 2, the opening of'which is tapered at? A contractible sleeve 4: is arranged in the opening in the extension 2. It has a tapered exterior surface 5 conforming to the surface 3. It is also screw-threaded at 6 at its inner end, this screw thread being preferably tapered in continuation of the taper 5. The sleeve has a longitudinal slot 7 extending through it which permits it to contract on an I inserted conduit 8. It is also provided with i a guard shoulder -9 at its inner end'against which theend of the conduit abuts.

A nut 10 is screwed on the screw-threaded end of the sleeve and is adapted, when tightened, to force the sleeve longitudinally in the tapered opening, thus contracting the sleeve into clamping engagement with the conduit,

1 the walls of the sleeve being preferably pro I vided with indenting protuberances 11 adapted to indent an enamel surface on the conduit so as to assure an electrical connection be tween the parts of the fitting and the conduit,

It is desirable to place the nut 10 within the body of the box but ordinarily this is inconvenient so far as the operation of the nut is concerned. With the present invention this is largely obviated as follows: The nut has a gear 12 formed upon'it and the gear 13 is adapted to mesh with the gear 12, these being miter gears as shown. The gear 13 is mounted on a key stem 14:, the key stein hav-- key may be turned. The walls of the extehsion 2 have the flat portions 8 and the outer surfaces of the sleeved have the flat portions 5 which engage the flat portions 3 and prevent the sleeve from turning in the opening in the extension. i

. l/V hen it is desired to clamp the conduit in place, the conduit is placed in a normally ex panded sleeve, the nutstarted on the end of the sleeve and the end of the key is placed in the socket 16 bringing the gear 13 in meshwith the gear 12. Under these conditions the nut may be readily turned by rotating the key with sufiicient forceto securely clamp the conduit in'the fitting. After the nut is fully set to place the key is removed and the nut is thus entirely housed within the fitting and occupies very little space within the guard shoulder end of the sleeve.

What I claim as new is I r In aiconduit fitting, the combination of a body having an open side, a conduit receiving opening therein and a key socket opposite che open side at the side of the opening; a slotted contractible sleeve in the opening, said sleeve being tapered and in'wedging engagement with the walls of the opening and havingits inner end the smaller and screwthreaded ;*a not within the body on the screwthreaded inner end having a gear thereon;

a gear engaging the gear on the nut.

In testimony whereof I have hereunto set my hand. I RUSSELL P. DUNMIRE.

and a key journaled in the socket and having ing a projection 15 which extends into a guide socket 16 in the body. The stem 14 is provided with a handle 17 by means of which the 

